I just bought a Singer 128k long bobbin hand crank from my local charity shop. The machine and case look in great condition but I haven't had a chance to try it yet as the shuttle is missing the bobbin, I have to source one. There is a video on youtube, which gives me an idea on how to give it a clean and service.
I like the idea of being able to sew off-grid so to speak. I volunteer at a local "museum" which has some really early machines and I want to be able to demonstrate on open days.